update code, warning when compile dev branch.

@@ -11,10 +11,8 @@
 
 #include "public.h"
 
-#if !defined(__ia64__)
+#if defined(__ia64__)
     #error "IA64 not supported"
-#else
-    #error "Only IA64 supported"
 #endif
 
 #define srs_trace(msg, ...)   printf(msg, ##__VA_ARGS__);printf("\n")

@@ -140,6 +140,7 @@ void check_macro_features()
 #endif
 
 #if VERSION_MAJOR > 1
+    #warning "using develop SRS, please use release instead."
     srs_warn("SRS %s is develop branch, please use %s instead", RTMP_SIG_SRS_VERSION, RTMP_SIG_SRS_RELEASE);
 #endif
 }